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ACPI: Enforce stricter checks for address space descriptors

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Enforce stricter checks for address space descriptors according to
ACPI spec.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu 2015-02-02 10:42:57 +08:00 committed by Rafael J. Wysocki
parent c78b688561
commit a274019fc3
1 changed files with 9 additions and 0 deletions
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9
drivers/acpi/resource.c
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@ -192,6 +192,15 @@ static bool acpi_decode_space(struct resource *res,
bool wp = addr->info.mem.write_protect; bool wp = addr->info.mem.write_protect;
u64 len = attr->address_length; u64 len = attr->address_length;
/*
* Filter out invalid descriptor according to ACPI Spec 5.0, section
* 6.4.3.5 Address Space Resource Descriptors.
*/
if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
(addr->min_address_fixed && addr->max_address_fixed && !len))
pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
addr->min_address_fixed, addr->max_address_fixed, len);
res->start = attr->minimum; res->start = attr->minimum;
res->end = attr->maximum; res->end = attr->maximum;